Safari No Longer Auto Opening PDF Files

Whenever I download pdf files on my MacBook Pro, Preview would always open them so I could see them.

I also use Adobe Acrobat to also look at pdfs and perform functions on the file, etc. When Acrobat asks me if I want to make Acrobat the default application for viewing PDFs, I always say no.

However, last week I accidentally said yes. Afterwards I followed the procedure for making Preview the default viewer for pdfs and when I open a pdf on my desktop or finder it opens with Preview.

However, now when I download a pdf, it doesn't open automatically at all.

Yes, the "Open 'Safe' files after downloading" box is checked in Safari preferences.

What do I need to do to restore auto-opening of pdfs using Preview when I download them?

Thanks for reading.